помогите переделать предложения из активного залога в пассивный! СПАСАЙТЕ!! ! если можно, сегодня!

Ржунимагу
he left for moskow - непереходный глагол, пассив невозможен
the news will be of great interest - непереходный глагол, пассив невозможен
they were speaking to him - he was being spoken to by them
she studied many subjects - many subjects were studied by her
he was much spoken of - уже пассив
i am working now - непереходный глагол, пассив невозможен
he studies at our school - непереходный глагол, пассив невозможен
oyu are plaing chess, aren't you? - получается глупая конструкция, но если надо, так надо: chess is playing by you, isn;t it? сам ржу не могу
do you work at this lab - непереходный глагол, пассив невозможен
when i saw him, he was going home - when he was seen by me... хотя звучит очень глупо
they will have passed their exams by 3 o'clock - their exams will have been passed by them by 3 o'clock
we shall be writing our tests at 10 o'clock - our tests will be being writen by us at 10 o'clock
we translated this text - this text was translated by us
we shall inform you - you will be informed by us
does he work here? - непереходный глагол, пассив невозможен
is he working now? - непереходный глагол, пассив невозможен
the conference will be held in May - уже пассив
what are you doing here? - глупая фраза, но сделаю: what is being done by you here?
this work must be done at once - уже пассив
you may take my book - my book may be taken by you
i am often asked at the lessons - уже пассив